Lock



Patented Dec. 25, 1928.

lNlTED STATES PATENT oFFicE.

JOHN JUNKUNG, OF CHICAGO, ILLINOIS.

LOCK.

Application filed November 16, 1923. Serial No. 675,642.

lock and concerns itself primarily with means for automatically closing the key hole thereof controlling the tumblers and securing the inner operating shank.

The invention comprises the novel structure and combinations hereinafter described and more particularly pointed out and delined in the appended claim.

In the accompanying drawings which illustrate a preferred embodiment of this in vention and in which similar reference numerals refer to similar features in the different views Fig. l is an elevational view of the lock and thimble casing.

Fig. 2 is an elevational view of the lock with the thimble casing removed.

Figs. 3 and 4 are plan views of the two halves of the key barrel.

Fig. 5 is a longitudinal section through the lock.

Fig. 6 is a section upon the line 66 of Fig. 5.

Fig. 7 is a sectional view upon the line 7-7 of Fig. 5.

Fig. 8 is a sectional view upon the line 88 of Fig. 5.

Fig. 9 is a sectional view upon the line 99 of Fig. 5.

Fig. 10 is a fragmentary sectional view of a modified form of attaching the inner operating knob.

Fig. 11 is a sectional view upon the line 11 of Fig. 10.

In referring to the drawings which illustrate a preferred embodiment of this invention, there is shown the two sections 1 and 2 of the key barrel; the former having the central V-shaped ridge 3, and the lat-.

ter having the grove 4 for accommodating.

the key. The intermediate portions of the barrel sections have the usual rejecting recess 5 for the tumblers 6 and washers 7 and 8. The barrel section 2 is also provided with a slot or recess 9 extending inwardly from its inner end and terminating in a flange or abutment 10. The slot is designed to receive a if-shaped wire spring 11 confined between the abutment 10 and the inner washer 7. The tumblers 6 are provided with dovetail recesses 12, as shown in Fig. 7, for receiving and confining the branches of the wire spring. This wire is for the purpose of normally projecting the tumblers into locking position, as will later more fully appear.

The barrel sections are provided with the usual marginal flanges or lips 13 so that when they are assembled sutlicient space will be defined therebetween for receiving the.

key. The outer end of the barrel section .2 is rabbeted indicated at i l, and is centrally recessed as indicated at 15. The outer end of the section 1 is also provided with a shallow rabbet 16, so the assembled barrel may be said to have a rabbet in one end. A. key hole guard or shield 17 in the form of a thin metal plate is provided and nested in the rabbet 14 of the barrel section 2, and having a depending lug 18 extending into the recess 15 and provided with an inturned flange 19, against which a coil spring 20 bears for normally projecting the guard upwardly for closing the key hole. This spring is confined in the recess 15 and rests upon the end inclosing cap 22, through which it may be inserted by a screw plug. This key hole guard is normally projected into the rabbet 16 of the barrel section 1, and in order to admit the key, it is provided with a small central bevelled recess 21 that normally registers with the key hole for receiving the bevelled end of the key which is properly fashioned for this purpose.

A stationary cylindrical locking sleeve 28 fits over the key barrel. This sleeve has diametrically opposite cut out portions 24 which are positioned opposite the tumblers 6 so the latter may be projected therein for locking the barrel against rotation as shown. in Fig. 6. A thimble sleeve 24 fits over the cap 22 and over the sleeve 23, and an inner end cap 25 is bolted to the key barrel and provided with the usual polygonal aperture for receiving the polygonal shank 26 that controls the locking belt or latches and that may be operated from the inner side of the door, as is well known. However, instead of securing the polygonal shank 26 as shown in Fig. 5, it may extend into a polygonal recess 27 formed in the inner end of the key barrel as shown in Figs. 10 and 11, and terminating in an enlargement for receiving the head of the shank.

In the operation o1 the device, the spring 11 normally projects the tumblers into the locking recess of the stationary locking sleeve 23, and the spring 20 normally projects the shield or guard 17 into operative position over the key hole. To open the door from the outside, the bevelled end of the key is inserted in the bevelled recess 21 of the key hole guard and forced inwardly,

the guard sliding back against the pressure of the sarin 20 into ino aerative )osition. O

allowing the key to enter the slot for with-H drawing the tumblers from looking engagement, so that the key barrel may be rotated. for operating the locking latches, As soon as the key is withdrawn, the spring 20 will project the guard over the slot.

I am aware that numerous details of construction may be varied through a wide semicylindrical sections, a cap fittingover the interior end of said sections, an' outer cap fitting over the exterior end of said sections,.-said cap being slotted to receive a key therethrough for engaging tumblers within the barrel and rotating said sections, one of said sections having a rabbet and a central recess, a spring in the recess supported by the exterior cap, the other section having a registering rabbet so that the as sembled barrel has a rabbet at one end, a

key-hole guard nested in the rabbet having a depending lug extending into said central JOHN 'JUNKUNC. 

